:root {
  --bg: #f7f4ee;
  --ink: #202124;
  --muted: #66645f;
  --line: #d8d0c3;
  --panel: #fffdf8;
  --accent: #176f62;
  --accent-dark: #0d4f46;
  --warn: #9b3f2f;
  --soft: #f3eee5;
  --shadow: 0 22px 70px rgba(32, 33, 36, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
  background:
    linear-gradient(135deg, rgba(23, 111, 98, 0.1), transparent 32%),
    radial-gradient(circle at 80% 20%, rgba(245, 197, 66, 0.16), transparent 24rem),
    var(--bg);
}

a {
  color: inherit;
}

.site-header {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 18px 0 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 900;
  text-decoration: none;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 800;
}

.site-nav a {
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--accent);
}

main {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.tool-layout {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(310px, 0.92fr);
  gap: 28px;
  align-items: center;
  padding: 36px 0 48px;
}

.workspace,
.preview,
.content-section,
.reader-view {
  background: rgba(255, 253, 248, 0.9);
  border: 1px solid rgba(216, 208, 195, 0.9);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.workspace,
.preview,
.content-section,
.reader-view {
  border-radius: 8px;
}

.workspace {
  padding: clamp(24px, 4vw, 42px);
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 900;
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1 {
  margin: 0;
  max-width: 12ch;
  font-size: clamp(2.45rem, 6vw, 5.1rem);
  line-height: 0.95;
}

h2 {
  margin: 0 0 20px;
  font-size: clamp(1.7rem, 3vw, 2.45rem);
  line-height: 1.18;
}

h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.intro {
  max-width: 650px;
  margin: 22px 0 28px;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.95rem;
  font-weight: 800;
}

textarea,
input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  outline: none;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease;
}

textarea {
  min-height: 190px;
  resize: vertical;
  padding: 18px;
  line-height: 1.6;
}

input {
  padding: 14px 16px;
}

textarea:focus,
input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(23, 111, 98, 0.14);
}

.meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 10px 0 20px;
  color: var(--muted);
  font-size: 0.9rem;
}

.share-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: end;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

button,
a.button {
  min-height: 46px;
  border: 0;
  border-radius: 8px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: #fff;
  background: var(--accent);
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 160ms ease,
    background 160ms ease,
    box-shadow 160ms ease;
}

button:hover,
a.button:hover {
  background: var(--accent-dark);
  box-shadow: 0 10px 24px rgba(23, 111, 98, 0.18);
  transform: translateY(-1px);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

button.secondary,
a.secondary {
  color: var(--ink);
  background: #ece5da;
}

button.secondary:hover,
a.secondary:hover {
  background: #dfd5c7;
  box-shadow: none;
}

.preview {
  padding: clamp(22px, 3vw, 34px);
}

.qr-frame {
  display: grid;
  place-items: center;
  min-height: 340px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(45deg, rgba(23, 111, 98, 0.06) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(23, 111, 98, 0.06) 25%, transparent 25%),
    #fff;
  background-size: 24px 24px;
}

canvas {
  width: min(260px, 72vw) !important;
  height: min(260px, 72vw) !important;
  padding: 12px;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 32px rgba(32, 33, 36, 0.12);
}

.empty {
  padding: 0 28px;
  color: var(--muted);
  text-align: center;
  line-height: 1.65;
}

.shared-text {
  margin-top: 18px;
  padding: 16px;
  border-radius: 8px;
  background: var(--soft);
  color: var(--muted);
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}

.network-notice {
  margin: 14px 0 0;
  padding: 14px 16px;
  border: 1px solid rgba(155, 63, 47, 0.28);
  border-radius: 8px;
  background: rgba(155, 63, 47, 0.08);
  color: var(--warn);
  font-size: 0.92rem;
  font-weight: 800;
  line-height: 1.6;
}

.status {
  min-height: 24px;
  margin-top: 14px;
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 700;
}

.status.error {
  color: var(--warn);
}

.reader-mode .site-header,
.reader-mode #tool,
.reader-mode .content-section,
.reader-mode .site-footer {
  display: none;
}

.reader-mode main {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px 0;
}

.reader-view {
  width: min(760px, 100%);
  padding: clamp(26px, 5vw, 48px);
}

.reader-view h1 {
  max-width: none;
  font-size: clamp(2rem, 6vw, 4.2rem);
}

.reader-text {
  min-height: 220px;
  margin-top: 24px;
  padding: clamp(20px, 4vw, 32px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: clamp(1.12rem, 2.5vw, 1.45rem);
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
}

.reader-actions {
  margin-top: 18px;
}

.content-section {
  margin: 0 0 28px;
  padding: clamp(24px, 4vw, 42px);
}

.text-grid,
.feature-grid {
  display: grid;
  gap: 18px;
}

.text-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.text-grid p,
.feature-grid p,
.policy p,
.faq-section p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.feature-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-grid article {
  min-height: 210px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.policy {
  display: grid;
  gap: 18px;
}

.policy h3 {
  margin-top: 6px;
}

.faq-section details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}

.faq-section details:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-section summary {
  cursor: pointer;
  font-weight: 900;
}

.faq-section summary + p {
  margin-top: 12px;
}

.site-footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 12px 0 36px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 960px) {
  .tool-layout,
  .text-grid,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .tool-layout {
    align-items: start;
    padding-top: 28px;
  }

  .feature-grid article {
    min-height: auto;
  }
}

@media (max-width: 720px) {
  .site-header,
  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  h1 {
    max-width: 100%;
    font-size: clamp(2.35rem, 14vw, 4rem);
  }

  .share-row {
    grid-template-columns: 1fr;
  }

  .share-row button,
  .buttons button,
  .buttons .button {
    width: 100%;
  }
}